ALLIANCE GIRLS HIGH SCHOOL FORM THREE AUGUST COMPUTER STUDIES HOLIDAY ASSIGNMENT 2016

Transcription

1 ALLIANCE GIRLS HIGH SCHOOL FORM THREE AUGUST COMPUTER STUDIES HOLIDAY ASSIGNMENT 2016 Answer all the questions provided on foolscaps. Section A (40 Marks) 1. A computer must go through the process of booting/initialization before use. (a) Explain the term booting. (b) Describe the booting process (c) Explain two types of booting 2. State two ways in which the computer systems can be protected against hacking. 3. What is an ? 4. Name the parts of an labeled: alliancegirlshigh@gmail.com X Y Z X. Y. Z.. 5. Distinguish between software engineer and a computer programmer 6. Explain three ways in which ICT can be used by the country to prepare against natural disasters 7. Describe two areas of application of artificial neural networks. 8. State two advantages of a keypad over a keyboard 9. List any four devices that make use of a keypad. 10. State two disadvantages of using barcodes 11. Explain two factors affecting the processing speed of a computer: 4mks 12. Differentiate between Mask ROM and PROM as used in computer systems 4mks 13. List two hardware considerations when purchasing a computer screen. 14. With an example list two types of Basic functions and formulae used in spreadsheets. 15. The table below shows values typed in a worksheet starting from cell A1. LEVEL AGHS /1 F3 August Holiday Assignment Page 1 of 6

2 An expression =COUNTIF (A2:A5,">3") is typed in cell B3. (a) What is its purpose? (b) What is the output of the expression? (c) How would it appear if copied to cell C10? (d) How can it be modified to serve its original purpose when copied to C10? SECTION B (60 MARKS) Answer question 16 and any other three question(s) in the space provided. Q16 A computer program is required which inputs 10 numbers, multiplies them together and finally outputs the answer (the product). A student provides the following algorithm to achieve this. 1 count = 0 2 product = 0 3 while count <= 10 do 4 input number 5 product = product * number 6 count = count print product 8 Endwhile (a) Identify three errors in the algorithm (b) Study the following pseudo code then answer the questions that follow. START W= 10 X=20 Y=2 Z=0 WHILE W<X W=W+2 REPEAT X=X-1 Y=Y+1 IF X=Y Z=Y+X END IF UNTIL Z>Y END WHILE PRINT W PRINT X PRINT Y PRINT Z STOP (i). Translate the above pseudo code into a flowchart. 6mks (ii). Write down the final value of: a) W b) X AGHS /1 F3 August Holiday Assignment Page 2 of 6

3 c) Y d) Z (iii) Differentiate the following terms as used in word processor. 4mks (a) Superscript and Subscript (b) Save and Save As Q17 (a) Define the term troubleshooting; (b) Write the following acronyms in full. (i). FAT (ii). NTFS (c) Joyce has noticed the following problems in her Computer: It is taking longer time to start up; It is often hanging; Applications are taking longer to load. State three possible causes of these problems and how they can be solved (d) Differentiate between pull-down menu and pop-up menu as used in Graphical User Interface (GUI) operating systems. (e) Explain the following terms: (a) Log off (b) Switch user (f) State two advantages of using desktop publishing over word processor. (g) List two techniques of acquiring electronic images to be used in a desktop publishing program. (h) State the role of the following in desktop publishing: (a) Printable area Q18 Motor boat Hire Company decides to set up a database to keep information about boats that are available for hire. The database table, BOAT, will contain the following fields: Boat Name; Model; Engine Power (in hp); Number of Seats; Life Raft (whether there is a life raft kept on the boat); Day Price (price for a day s hire). AGHS /1 F3 August Holiday Assignment Page 3 of 6

4 (a) Give the data type you would choose for each field. Boat Name... Model... Number of Seats... Life Raft... (b) State a validation check that you can perform on each of these fields. Each validation check must be different. Boat Name... Model... Number of Seats / (c) Complete the query-by-example grid below to select and show the Boat Name, Model and Day Price of a day s hire for all boats with 4 seats and an Engine Power of more than 100 hp. Field: Table: Sort: Show: Criteria: or: (d) Define the term normalization as used in electronic databases. 2 1 / (e) If represents B in ASCII code, what is the ASCII code for letter L? (f) Convert the denary to binary equivalent. Show your working. (g) Convert the binary number to an octal number. Show steps. 2mk (h) Perform the arithmetic operation: and convert the answer to decimal notation 1 1 / (i) The security code for an alarm system is a long binary number which begins The technicians prefer to use hexadecimal to enter the security code. When the number is converted into hexadecimal, the first two digits are 8F as shown below Complete the gaps to show the next three digits. 1 1 / AGHS /1 F3 August Holiday Assignment Page 4 of 6

5 Q19 (i). When a new system is implemented, documentation is provided with it. Name two types of program documentation. (ii). Define the following terms as used in information system development: (a) System entropy. (iii). State three main purpose of an information system in an organization. (iv). What is feasibility study? (v). Explain any two examples of feasibility study carried out during development of a new system. 4mks (vi). Highlight three circumstances that necessitate the development of new information systems Q20 (i). List three examples of unbounded media. 1 1 / (ii). A large company has two separate sites both of which have a LAN. The manager of the company wants to connect the LANs to form a WAN. a. Name three network devices which could be found in a LAN that is not connected to a WAN. 1 1 / (b) The manager wants to buy a router to connect the LANs. Describe two functions of a router. (c) The company s workers are concerned that their data may not be secure. Name two authentication techniques and for each one explain how it will help to prevent illegal access to the data. 4mks (iii). Explain any three stages of data collection AGHS /1 F3 August Holiday Assignment Page 5 of 6

6 (iv). As a journalism club member, you have been tasked by the club to collect and compile news items over a weekend event to be presented at the assembly the following week. a. List two methods of data processing you could use. b. Explain one Data integrity measure your data should meet. AGHS /1 F3 August Holiday Assignment Page 6 of 6